bim.02 integrated cost estimating model for bldg projects integrated cost... · integrated cost...
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BIM.02integrated cost budgeting and cost
estimating model for building projects
sarmad al-mashtadr. sabah alkass
Author BiographyDegree: M.A.Sc. Building Engineering
B.Sc. Architectural Engineering
University: Concordia UniversityUniversity of Baghdad
Years of Experience: 16
Professional Field: Architectural designInterior Design
Tools Developed: Fenestration Management SystemAutomated Cost EstimationCPI 3D VisualizationRisk Registrar
agenda
introduction literature reviewproblem statement
methodology
proposed model
case study
conclusion
assembly costingmapping different WBS
research contributionresearch limitation
introduction
scope
objectives
research
building projectsassets cost
streamline cost estimate processintegrated model
cost estimates class 1/2 AACEmultiple WBS simultaneouslymultiple cost sources
AACE classification
6
work breakdown structure (WBS)
deliverable-oriented hierarchy of decomposed project components that organizes and defines the total scope of the project(PMI)
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literature review
WBS types (CSI and CSC)functional elements of buildingowner, designer, or general contractorUniformat™
materials & methods or “work results”specifier or subcontractorMasterFormat™
productsproduct representative
8
Estimating Process
WBS
input process output
cost estimate
quantity take-off
cost data lookup
project design
cost data
calculate
group & classify
9
automated quantity take-offCAD based
2D, requires user input of 3D dimension3D geometric data, generic solids require user input to identify object type
BIM basedfull object oriented 3D geometric dataParametric environment, data replication
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types of quantitiesproduct/procurement quantities (PPQ)
physical material quantities part of final building productdetermined by the design
length and weight of rebar, volume of concrete beams, areas of metal decking
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types of quantitiesProcess of Construction Quantities (PCQ)
depend on construction process/methods, specific conditions of jobbased on
more detailed breakdown of associated PPQsproductivity factors, ex. locations, geometric characteristics, construction methods
shoring/scaffolding, areas of formwork, labour hours for hanging drywall, and excavation quantities for earthwork
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Traditional vs. Automated
2D paper drawings from design/
engineering team
2D paper drawings from design/
engineering team
Manual takeoff and manual check for
“conditions”
Manual takeoff and manual check for
“conditions”
Estimating SoftwareEstimating Software
Manually associate take-off info. with assembly items
Manually associate take-off info. with assembly items
Associate digitized take-off info. with
component
Associate digitized take-off info. with
component
3D/BIM models from
project
3D/BIM models from
project
Extract quantities within BIM tool
Extract quantities within BIM tool
Manually extract quantities with
specialized take-off / estimating tool
Manually extract quantities with
specialized take-off / estimating tool
Associate with assembly itemsAssociate with assembly items
Auto-extract and associate with
assembly items
Auto-extract and associate with
assembly items
Calculation of additional
quantities item properties
Calculation of additional
quantities item properties
Cost database
Cost database
Supplier / subcontractor
pricing
Supplier / subcontractor
pricing
EstimateEstimate
Traditional paper-based estimating process
Automated estimating process
Manual link, changes must be updated by estimator
Digital link, changes updated automatically
13
problem statementcost estimate is time consuming task
performed at distant points leaving gaps
lack of framework and methodology for automated detailed cost estimating
automated quantity take-off for PCQuse of TWBS….
14
methodology
assembly costing
components that are commonly encountered in the construction are viewed as estimating group (Halpin)
assembly costing
component 1component 2
component 3component 4component n
assembly cost
assembly cost
materia
ls
materia
lsequipment
equipmentlabour
labour
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mapping EWBS to TWBS
assembly cost
assembly cost
materialsmaterials
equipmentequipment
labourlabour
component 1
materialsmaterials
equipmentequipment
labourlabour
component 2
materialsmaterials
equipmentequipment
labourlabour
component n
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mapping EWBS to TWBS
UniFormat: System B1010 219 3000: BM. & Slab One way 15’x15’ Bay, 40 PSF S. Load, 12” Min. Col.
UniFormat: System B1010 219 3000: BM. & Slab One way 15’x15’ Bay, 40 PSF S. Load, 12” Min. Col.
Forms In Place, Flat Plate to 15’ High, 4 usesForms In Place, Flat Plate to 15’ High, 4 uses
Reinforcing in place, elevated slabs #4 to #7Reinforcing in place, elevated slabs #4 to #7
Concrete Ready mix, regular Weight 3000 psiConcrete Ready mix, regular Weight 3000 psi
Place and vibrate concrete, elevated slab less than 6”, pump
Place and vibrate concrete, elevated slab less than 6”, pump
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proposed model
proposed model components
Database Solution
CAD/BIMWith quantity take-off module
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AssembliesAssemblies
Cost Estimates(Assemblies)
Cost Estimates(Assemblies)
CAD/BIMCAD/BIM
Cost Data(3rdParty)Cost Data(3rdParty)
TWBS(MasterFormat)
TWBS(MasterFormat)
Cost Estimates(Trades)
Cost Estimates(Trades)
Cost Data(In-house)Cost Data(In-house)
EWBS(UniFormat)
EWBS(UniFormat)
ComponentsComponents
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proposed model design (simplified)
proposed model designEWBS componentsEWBS components TWBS componentsTWBS components
B.O.QB.O.Q
Cost Estimates(Assemblies)
Cost Estimates(Assemblies)
System CoreFunctions
(Set-1)
System CoreFunctions
(Set-1)
CAD/BIMCAD/BIM
EWBS(Other)EWBS
(Other)
Cost Data(3rdParty)Cost Data(3rdParty)
TWBS(Other)TWBS
(Other)
TWBS(MasterFormat)
TWBS(MasterFormat)
Assemblies ComponentsAssemblies
Components
Cost Estimates(Trades)
Cost Estimates(Trades)
GACGACSystem Core
Functions(Set-2)
System CoreFunctions
(Set-2)
GenericGeneric
Cost Data(In-house)Cost Data(In-house)
EWBS(UniFormat)
EWBS(UniFormat)
SCMLSCML
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How it Works
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proposed model topology
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step I: cost data processing
cost data(RS Means)
cost data(In-House)
EWBS
input process output
GAC
Standardize(assemblies)
MapStandardize(assemblies)
SCML
Standardize(Sys. Components)
Standardize(Sys. Components) Map
TWBS
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step II: quantity take-off
geometrical data
GAC
user(CAD/BIM GUI)
elemental B.O.Q.
link(assembly code)
input process output
data export(ODBC)
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step III: cost calculation
elemental B.O.Q.
SCML
GAC
elemental cost
cost data lookup
input process output
trade costmapping(EWBS to TWBS)
cost data lookup
calculate
calculate
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step IV: cost estimate reporting
elemental cost
trades cost
user(RDBMS GUI)
elemental cost reports
trades cost reports
group & classify
input process output
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cost estimate reportsEWBS cost estimate level 5EWBS cost estimate level 4assemblies with no cost dataTWBS cost estimate level 5TWBS cost estimate level 4TWBS cost estimate level 5 by EWBSTWBS cost estimate level 4 by EWBS
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research contributionsIntegrated model streamline cost estimate process
cost monitoring for design phases
framework multiple simultaneous WBSmultiple cost data sources
addressing particular limitations of current 3D modelling technologies
detailed quantity take-off from generic model
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research limitation
assembly unit cost hides the productivity factor
no optimization
no consideration for the schedule effects
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quick democase study
?
33
case study projectquick demo
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linking BIM object to GAC entry
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EWBS cost estimate report snapshot(level 4)
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EWBS cost estimate chart(level III)
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TWBS cost estimate report snapshot(level 4)
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Questions ?
thank you